Use the coxme funtion (package coxme), which has the same syntax as lme4. The frailty() function in coxph only handles the simple case of a random intercept.
Terry Therneau On 12/12/2014 05:00 AM, r-help-requ...@r-project.org wrote:
Hi, I have a very simple Cox regression model in which I need to include a nested random effect: individual nested in treatment. I know how to pass a single random effect - e.g. frailty(id)- but how can I specify the nested random (id nested in treatment) effect using frailty? The equivalent in lme4 would be (treatment|id) Thanks! David
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